What Causes the Headlights Not to Work After Battery Replacement?

[RosalieMarie]

Possible reasons include the new battery's larger capacity, which significantly diverts the electricity generated by the alternator, leading to a drop in the overall circuit voltage. This may make the headlights appear dimmer than before. There are several precautions to note when replacing a car battery: Locate the battery position: You need to find the battery location, which is usually under the hood. For some models, it might be in the trunk or under the seat. It's essential to distinguish between a regular battery and a start-stop battery and accurately identify the positive and negative terminals. Clean the terminal corrosion: If there is terminal corrosion during replacement, it must be thoroughly cleaned. Tighten the bolts securely: During installation, the fixing bolts must be tightened securely to prevent the terminals from loosening due to driving vibrations, which could cause sparks and pose serious safety hazards. When removing the battery, disconnect the negative terminal first, then the positive. When installing, connect the positive terminal first, then the negative, and ensure the terminal clamps are tightly secured.